A US woman who shot and killed her husband and two adult children before taking her own life is thought to have committed the shocking crime as a result of being ostracised from the religion she was raised in.

A federal judge sentenced a former Arkansas judge Wednesday to five years in prison — a stiffer punishment than prosecutors recommended — after he admitted giving young male defendants lighter sentences in return for personal benefits that included sexual favours.

Every time I tell a mate I’m doing a story on cryptocurrency, they invariably ask me the same two questions: should they invest their own hard-earned money, and which cryptocurrency will get them a Lamborghini/yacht/island quickest?

In a 60 Minutes online exclusive, reporter Liz Hayes quizzed Australian Prime Minister Malcolm Turnbull on his relationship with the unpredictable Twitter aficionado and US president Donald Trump ahead of their meeting at the White House Friday.

Risk of market complacency: FSB

The group tasked with providing solutions for global financial regulation has warned there are increasing signs of complacency at a time of emerging risks.

The Financial Stability Board (FSB) says while banking reforms have been undertaken since the 2008-09 global financial crisis, there are concerns about mispricing risk in other areas of the global system, including corporate debt markets.

"Pressures on market liquidity could exacerbate downward price dynamics and market dislocations during a price fall," it said in a statement following a two-day-meeting in Cairns.

However, it says authorities are stepping up their monitoring of risks to less-regulated parts of the financial system and emerging economies have taken policy measures to reduce risks that could arise from volatile capital flows.

At its meeting before the G2O finance ministers and central bankers meeting in Cairns this weekend, the FSB has put together draft proposals to end the risk of too-big-to-fall banks - in order to avoid tax payers having to bear the cost of a bailout.

Proposals are due to be finalised in 2015.

The meeting also discussed so-called "shadow banking" to make sure such entities that perform bank-like functions do not become a new source of risk.

A third area was in over-the-counter (OTC) derivatives, markets that are less formalised, like stock exchanges and futures markets.

It said progress was being made in resolving issues over cross-border trading reforms.

"Members emphasised the importance of authorities moving quickly to address issues to ensure that the benefits to global financial stability of these reforms are achieved," it said.